Constant pitch variable speed audio decoding

Details Constant pitch variable speed audio decoding Constant pitch variable speed audio decoding

2005-09-07

2009-08-25

McFadden, Susan (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

07580833

ABSTRACT:
A digital audio signal can be processed to have a constant pitch for a range of playback rates. A playback rate associated with a portion of the digital audio signal can be received, which differs from the rate at which the digital audio signal was recorded. A channel of the digital audio signal can be divided into a plurality of windows and one or more cross-correlation evaluations can be performed for at least a first window and a second window of the channel to determine an appropriate overlap. Further, the first cross-correlation evaluation can be performed using an ideal overlap. One or more sample values associated with a first waveform included in the first window can be averaged with one or more corresponding sample values associated with a second waveform included in the second window for the determined appropriate overlap to generate a rate-modified audio signal, which can be played.

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S. Roucos and A. Wilgus, High quality time-scale modification for speech. In Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing, pp. 493-496. IEEE. 1985.

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